Hilton Whittle, Shabbar Jaffar, Michael Wansbrough, Maimuna Mendy, Uga Dumpis, Andrew Collinson et al
Whittle H, Jaffar S, Wansbrough M, Mendy M, Dumpis U, Collinson A et al.
Observational study of vaccine efficacy 14 years after trial of hepatitis B vaccination in Gambian children
BMJ 2002; 325 :569
doi:10.1136/bmj.325.7364.569